【stut 逆置正整数】

 1 import java.util.Scanner;
 2 public class Main {
 3     public static void main(String[] args) {
 4         Scanner scn=new Scanner(System.in);
 5         String str=scn.next();
 6         StringBuffer sb=new StringBuffer(str);
 7         str=sb.reverse().toString();
 8         str=str.replaceAll("0*(\\d+)", "$1");
 9         System.out.println(str);
10         scn.close();
11     }
12 }